No, really, BlackBerry is an equal opportunity charger up to a certain amount of current, with the max being either 1300or 1600ma, and minimum being USB charging, which is approximately 100-200 ma. (auto chargers are generally 250 ma.

I've seen plenty of BlackBerry microUSB chargers on Amazon.com for around $3-5 shipped. Don't recall seeing any inserts for the dual charger, but could have missed that.